MSSL Space Plasma Science Nuggets http://www.ucl.ac.uk/mssl/space-plasma-physics/plasma-nuggets-viewer/rss Colin Forsyth 2011-08-16T09:54:46Z Structure and variability of the auroral acceleration region http://www.ucl.ac.uk/mssl/space-plasma-physics/nuggets/mssl-plasma-nuggets/aar-structure Bright auroral arc appear when charged particles from the magnetosphere are accelerated into the upper atmosphere. Collisions between charged particles and neutrals excite the electrons in the neutral particles which then de-excite by emitting auroral light. Particles, in particular electrons, are accelerated out of the magnetosphere and into the atmosphere by magnetic-field-aligned electric potential drops in a region known as the auroral acceleration region (AAR). In a recent paper, Forsyth et al. [2012] investigated the temporal variability and spatial structure in one such region. space plasma physics research at UCL MSSL Colin Forsyth 2013-02-05T12:19:23Z What is the source of magnetotail flux-ropes? http://www.ucl.ac.uk/mssl/space-plasma-physics/nuggets/mssl-plasma-nuggets/beyene-flux-rope Travelling compression regions (TCRs) are perturbations in the magnetotail lobe magnetic field caused by structures moving Earthward or tailward within the plasma sheet. Previous works have suggested that these structures are created by either time-dependant reconnection occurring at a single X-line, forming a flux-bulge-type structure, or space-variant reconnection at multiple X-lines, forming flux-rope-type structures. By analysing a TCR and its source structure using the Cluster spacecraft, Beyene et al. (2011) have endeavoured to determine which of these mechanisms creates TCRs. space plasma physics research at UCL MSSL Colin Forsyth 2011-12-12T10:10:41Z Particle Distributions in the Magnetotail http://www.ucl.ac.uk/mssl/space-plasma-physics/nuggets/mssl-plasma-nuggets/walsh-magnetotail-distributions For the first time, Walsh et al. have examined, in detail, the particle distributions in the magnetotail to determine the average pitch angle distributions.  space plasma physics research at UCL MSSL Colin Forsyth 2011-08-17T13:45:24Z Calculating currents from four spacecraft http://www.ucl.ac.uk/mssl/space-plasma-physics/nuggets/mssl-plasma-nuggets/forsyth-curlometer Ampere's law tells us that the curl of a magnetic field is proportional to current density. In order to measure the curl of a magnetic field in space, one needs to know approximate the variation of the magnetic field between four non-coplanar points. Such measurements are achieved by the Cluster quartet. space plasma physics research at UCL MSSL Colin Forsyth 2011-08-22T08:39:05Z Discovery of the 'Travelling Magnetopause Erosion Region' http://www.ucl.ac.uk/mssl/space-plasma-physics/nuggets/mssl-plasma-nuggets/owen-magnetosphere-erosion Recent work by Owen et al.  has shed new light on the structure of the magnetopause following bursts of reconnection through the discovery of 'Travelling Magnetopause Erosion Regions'. space plasma physics research at UCL MSSL Colin Forsyth 2011-08-17T12:27:47Z